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kow [346]
3 years ago
6

Arithmetic Sequence Need Assistance

Mathematics
1 answer:
PIT_PIT [208]3 years ago
4 0

let the first term is a

by the sum of first n term formula

\frac{20}{2}(2a+19d)=25a\\20a+190d=25a15\\190d=5a\\a=38d

substitute to sum of first 30 term

\frac{30}{2}(2a+29d)=\frac{30}{2}(2(38d)+29d)\\=15(76d+29d)\\=15(105d)\\=1575d

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Harlamova29_29 [7]

Answer:

Step-by-step explanation:

idk number one.

Number 2- the answer is (C) because $6.50 minus the $5 is $1.50 and then that divided by $0.50 is 3.

Number 3- The answer is (A) and i dont feel lie explaining it

Number 4- The answer is (B)

Number 5- Im just going to say that it's probably going to be (C)

Number 6- i think its (D)

6 0
3 years ago
Angela and Michelle shared some money in the ratio 4: 9 then Angela gave Daniel half her share.Michelle gave Daniel a third of h
SVEN [57.7K]

Using a system of equations, it is found that £52 was originally shared.

<h3>What is a system of equations?</h3>

A system of equations is when two or more variables are related, and equations are built to find the values of each variable.

In this problem, the variables are given as follows:

  • Variable x: Angela's share.
  • Variable y: Michelle's share.
  • Variable z: Daniel's share.

Angela and Michelle shared some money in the ratio 4: 9, hence, considering t as the total:

  • x = \frac{4t}{13}.
  • y = \frac{9t}{13}

Angela gave Daniel half her share.Michelle gave Daniel a third of her share. Daniel was given a total of £20, hence:

\frac{x}{2} + \frac{y}{3} = 20

\frac{4t}{26} + \frac{9t}{39} = 20

\frac{12t + 18t}{78} = 20

30t = 20 x 78

t = 20 x 78/30

t = £52.

More can be learned about a system of equations at brainly.com/question/24342899

#SPJ1

5 0
2 years ago
A number has the same digit in its hundreds place and its hundredths place.
Yuki888 [10]

Answer:

One is 2 0's before the decimal point (100) and the other is 2 decimal places AFTER the decimal point (0.01)

Essentially, the question is asking us how many times do we multiply 0.01 to get 100? This will be how many times greater 100 is compared to 0.01

Lets move the decimal point  4 times to the right:

0.01

00.1

1.0

10.0

100.0

Step-by-step explanation:

7 0
3 years ago
2(-4y-7)+3=11 solve for y
Vikki [24]

Answer:

y = -11/4

Step-by-step explanation:

2 ( -4y - 7) + 3 = 11

-8y - 14 + 3 = 11

-8y - 11 = 11

-8y = 22

y = -11/4

8 0
3 years ago
Read 2 more answers
What is the answer to 2(2x+2)
STatiana [176]
4x+4 you have to distribute it
4 0
4 years ago
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